What is a trust angle?

A trust angle is not an obtuse angel, not an acute angle, not a right angle, or any other kind of angle I can imagine. So therefore it must be some new species of angle that has some how evolved, as Darwin's Theory thusly applied to modern math would have us believe...

And why do people still believe Darwin?

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Is it possible you mean THRUST angle? If so, you are the victim of a question being in the wrong category- math, instead of automotive. THRUST angle refers to a form of wheel alignment on a vehicle- rather than simply aligning each tire in relation to the lines of the frame, the tires are aligned to an imaginary line of the thrust applied to the frame. Ordinary alignment is good in theory, but thrust angle alignment has tires aligned for a real world setting. Perhaps a REAL mechanic can improve my layman's definition.